There's a Rubyforge project I admin that I unfortunately don't have
time to adequately maintain anymore. It's probably about 75% completed
and if anyone is interested please let me know and I'd be happy to
turn over the reigns. The project can be found at http://tsapi.rubyforge.org
and provides a CTI library in Ruby for developing TSAPI applications.

Admittedly with VoIP being the defacto standard nowadays the
technology might be a bit dated, but for businesses with older, legacy
AT&T/Lucent/Avaya telephone equipment it can provide relatively
sophisticated features for little to no cost. If you're interested in
taking over the project just give me a shout!